@article {Chamberland:2013-09-01T00:00:00:0746-8342:322,
author = "",
title = "Proof Without Words: The Area of an Inner Square",
journal = "The College Mathematics Journal",
volume = "44",
number = "4",
year = "2013-09-01T00:00:00",
abstract = "What is the area of the (inner) square obtained by slicing the corners off a larger square? This visual proof avoids algebra by considering the area of a parallelogram.",
pages = "322-322",
url = "http://www.ingentaconnect.com/content/maa/cmj/2013/00000044/00000004/art00012",
doi = "doi:10.4169/college.math.j.44.4.322"
}